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Winter Weather in Roxby Downs South Australia, Australia

Daily high temperatures increase by 5°F, from 65°F to 70°F, rarely falling below 57°F or exceeding 81°F. The lowest daily average high temperature is 62°F on July 4.

Daily low temperatures are around 47°F, rarely falling below 39°F or exceeding 57°F. The lowest daily average low temperature is 44°F on July 7.

For reference, on January 12, the hottest day of the year, temperatures in Roxby Downs typically range from 71°F to 95°F, while on July 7, the coldest day of the year, they range from 44°F to 63°F.

Average High and Low Temperature in the Winter in Roxby Downs

Average High and Low Temperature in the Winter in Roxby DownsJunJulAug35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FFallSpringJun 2962°FJun 2962°F45°F45°FJun 165°FJun 165°F48°F48°FAug 3170°FAug 3170°F50°F50°FAug 165°FAug 165°F45°F45°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average winter temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in the Winter in Roxby Downs

Average Hourly Temperature in the Winter in Roxby DownsJunJulAug12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMFallSpringNowNowcoldcoldcoolcomfortablecomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Wildwood, Texas, United States (9,420 miles away) and Thomasville, Georgia, United States (10,033 miles) are the far-away foreign places with temperatures most similar to Roxby Downs (view comparison).

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The winter in Roxby Downs experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 29% to 14%. The lowest chance of overcast or mostly cloudy conditions is 12% on August 9.

The clearest day of the winter is August 9, with clear, mostly clear, or partly cloudy conditions 88% of the time.

For reference, on November 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 30%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 88%.

Cloud Cover Categories in the Winter in Roxby Downs

Cloud Cover Categories in the Winter in Roxby DownsJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpringNov 2170%Nov 2170%Jun 171%Jun 171%Aug 3186%Aug 3186%Jul 180%Jul 180%Aug 187%Aug 187%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Roxby Downs, the chance of a wet day over the course of the winter is gradually decreasing, starting the season at 9% and ending it at 6%.

For reference, the year's highest daily chance of a wet day is 9% on June 1, and its lowest chance is 4% on April 9.

Probability of Precipitation in the Winter in Roxby Downs

Probability of Precipitation in the Winter in Roxby DownsJunJulAug0%0%1%1%2%2%3%3%4%4%5%5%6%6%7%7%8%8%9%9%FallSpringJun 19%Jun 19%Aug 316%Aug 316%Jul 15%Jul 15%Aug 15%Aug 15%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the winter in Roxby Downs is gradually decreasing, starting the season at 0.6 inches, when it rarely exceeds 1.8 inches, and ending the season at 0.3 inches, when it rarely exceeds 1.0 inches or falls below -0.0 inches.

The lowest average 31-day accumulation is 0.2 inches on July 8.

Average Monthly Rainfall in the Winter in Roxby Downs

Average Monthly Rainfall in the Winter in Roxby DownsJunJulAug0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 inFallSpringJul 80.2 inJul 80.2 inJun 10.6 inJun 10.6 inAug 310.3 inAug 310.3 inAug 10.3 inAug 10.3 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of the winter in Roxby Downs, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 10 minutes, implying an average daily increase of 46 seconds, and weekly increase of 5 minutes, 22 seconds.

The shortest day of the winter is June 21, with 10 hours, 10 minutes of daylight and the longest day is August 31, with 11 hours, 27 minutes of daylight.

Hours of Daylight and Twilight in the Winter in Roxby Downs

Hours of Daylight and Twilight in the Winter in Roxby DownsJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFallSpringJun 2110 hr, 10 minJun 2110 hr, 10 mindaydaydaydaynightAug 3111 hr, 27 minAug 3111 hr, 27 minAug 110 hr, 40 minAug 110 hr, 40 minNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the winter in Roxby Downs is 7:20 AM on July 1 and the earliest sunrise is 41 minutes earlier at 6:39 AM on August 31.

The earliest sunset is 5:28 PM on June 10 and the latest sunset is 38 minutes later at 6:06 PM on August 31.

Daylight saving time is observed in Roxby Downs during 2024, but it neither starts nor ends during the winter, so the entire season is in daylight saving time.

For reference, on December 21, the longest day of the year, the Sun rises at 6:16 AM and sets 14 hours, 8 minutes later, at 8:24 PM, while on June 20, the shortest day of the year, it rises at 7:18 AM and sets 10 hours, 10 minutes later, at 5:29 PM.

Sunrise & Sunset with Twilight in the Winter in Roxby Downs

Sunrise & Sunset with Twilight in the Winter in Roxby DownsJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFallSpring6:39 AM6:39 AMAug 316:06 PMAug 316:06 PM7:15 AM7:15 AMJun 105:28 PMJun 105:28 PM7:20 AM7:20 AMJul 15:32 PMJul 15:32 PM7:08 AM7:08 AMAug 15:49 PMAug 15:49 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the winter. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in the Winter in Roxby Downs

Solar Elevation and Azimuth in the Winter in Roxby DownsJunJulAug12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMFallSpring001020203030500010102030304040NowNow
northeastsouthwest
Solar elevation and azimuth in the the winter of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the winter of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Winter in Roxby Downs

Moon Rise, Set & Phases in the Winter in Roxby DownsJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringMay 812:53 PMMay 812:53 PMMay 2311:24 PMMay 2311:24 PMJun 610:08 PMJun 610:08 PMJun 2210:39 AMJun 2210:39 AMJul 68:28 AMJul 68:28 AMJul 217:48 PMJul 217:48 PMAug 48:44 PMAug 48:44 PMAug 203:56 AMAug 203:56 AMSep 311:26 AMSep 311:26 AMSep 1812:05 PMSep 1812:05 PM6:47 AM6:47 AM5:34 PM5:34 PM5:03 PM5:03 PM7:39 AM7:39 AM4:57 PM4:57 PM4:29 PM4:29 PM7:31 AM7:31 AM7:39 AM7:39 AM5:40 PM5:40 PM5:22 PM5:22 PM7:59 AM7:59 AM5:33 PM5:33 PM5:22 PM5:22 PM7:13 AM7:13 AM6:42 AM6:42 AM5:19 PM5:19 PM6:16 AM6:16 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Roxby Downs is essentially constant during the winter, remaining around 0% throughout.

For reference, on January 24, the muggiest day of the year, there are muggy conditions 4% of the time, while on May 12, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Winter in Roxby Downs

Humidity Comfort Levels in the Winter in Roxby DownsJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FallSpringJun 10%Jun 10%Aug 310%Aug 310%Jul 10%Jul 10%Aug 10%Aug 10%NowNowdrydrycomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Roxby Downs is increasing during the winter, increasing from 8.7 miles per hour to 10.7 miles per hour over the course of the season.

For reference, on November 26, the windiest day of the year, the daily average wind speed is 11.8 miles per hour, while on May 18, the calmest day of the year, the daily average wind speed is 8.6 miles per hour.

Average Wind Speed in the Winter in Roxby Downs

Average Wind Speed in the Winter in Roxby DownsJunJulAug0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mphFallSpringJun 18.7 mphJun 18.7 mphAug 3110.7 mphAug 3110.7 mphJul 19.0 mphJul 19.0 mphAug 19.7 mphAug 19.7 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Roxby Downs during the winter is predominantly out of the south from June 1 to June 17 and from August 6 to August 31 and the north from June 17 to August 6.

Wind Direction in the Winter in Roxby Downs

Wind Direction in the Winter in Roxby DownsSNSJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%FallSpringNowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Roxby Downs are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in the Winter in Roxby Downs

Time Spent in Various Temperature Bands and the Growing Season in the Winter in Roxby DownsJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpring100%Jul 17100%Jul 17NowNowvery coldcoldcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Roxby Downs are very rapidly decreasing during the winter, decreasing by 5,974°F, from 6,361°F to 387°F, over the course of the season.

Growing Degree Days in the Winter in Roxby Downs

Growing Degree Days in the Winter in Roxby DownsJunJulAug1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°F6,000°F6,000°FFallSpringJun 16,361°FJun 16,361°FAug 31387°FAug 31387°FJul 10°FJul 10°FAug 1152°FAug 1152°F
The average growing degree days accumulated over the course of the winter, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Roxby Downs is rapidly increasing during the winter, rising by 1.9 kWh, from 3.3 kWh to 5.2 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 3.2 kWh on June 15.

Average Daily Incident Shortwave Solar Energy in the Winter in Roxby Downs

Average Daily Incident Shortwave Solar Energy in the Winter in Roxby DownsJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhFallSpringJun 153.2 kWhJun 153.2 kWhAug 315.2 kWhAug 315.2 kWhJul 13.3 kWhJul 13.3 kWhAug 14.1 kWhAug 14.1 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Roxby Downs are -30.563 deg latitude, 136.895 deg longitude, and 351 ft elevation.

The topography within 2 miles of Roxby Downs contains only modest variations in elevation, with a maximum elevation change of 108 feet and an average elevation above sea level of 359 feet. Within 10 miles also contains only modest variations in elevation (315 feet). Within 50 miles contains only modest variations in elevation (741 feet).

The area within 2 miles of Roxby Downs is covered by sparse vegetation (80%) and artificial surfaces (19%), within 10 miles by sparse vegetation (83%) and grassland (12%), and within 50 miles by sparse vegetation (77%) and grassland (13%).

This report illustrates the typical weather in Roxby Downs, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There is only a single weather station, RAAF Woomera Airfield, in our network suitable to be used as a proxy for the historical temperature and dew point records of Roxby Downs.

At a distance of 65 kilometers from Roxby Downs, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Roxby Downs according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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